Which of the following describes an ideal standard?

A

A standard which can be attained under perfect operating conditions, and which

does not include an allowance for wastage, spoilage, machine breakdowns and

other inefficiencies

B $1$ A standard which is based on currently attainable working conditions

C A standard which is established for use over a long period, which is used to

show trends

D A standard which can be attained if production is carried out efficiently,

machines are operated properly and$/$or materials are used properly; some

allowance is made for waste and inefficiencies